Process Technology & Engineering Expertise

Fine powders of approved grades are first conditioned to the desired temperature

Tubes are extruded to a size somewhat larger than the I.D. of steel housing. Extrusion dies are designed to ensure a higher wall thickness than that specified in the ASTM

Extruded tubes are sintered using a programmed sinter cycle. In this process, the heating and cooling cycle is precisely controlled and monitored to ensure that the entire tube achieves a high molecular crystallinity with low void content which helps in reducing permeation and allows the pipe work to work for an extended time period

Sintered PTFE tubes are first "roll tested" and then subjected to a series of quality checks which are carried out in our laboratary to ensure liner integrity and compliance to ASTM specifications

The liner is then drawn through sizing dies at controlled draw rates which results in a calculated reduction in the liner diameter. This drawn liner is inserted into the metal pipe

In the relaxation process which follows, the liner is allowed to relax inside the pipe housing, resulting in a snug liner fit, a procedure adhered and maintained to eliminate undesirable stress in the finished product

The two ends of projected liners are then hot flared so as to form a gasket over the flange face using controlled temperature, time and pressure

Finished pipes are then tested as per the testing requirements specified in the ASTM F 1545

This unique method of lining pipes is known as the Thermalok® process which was then patented by Resistoflex. This process ensures that the steel pipe and liner act as one integral piece

The final product - an "optimized lined piping system" - the full strength of the metallic pipe and the corrosion resistance of the liner

The Thermalok® process provides dimensional stability to the lined pipe under vacuum, pressure, and thermal cyclic conditions, and also prevents the liner from buckling and/or the flares to get cut off.

Customer Service & Support

Detailed Bill of Material prepared from set of isometric drawings supplied by the customer, with part numbers and physical description of each item which will appear on the final product for quick identification

Engineers/technicians available on request, for visiting job site for assistance and measuring the proposed pipeline, and preparing ISO drawings with full bill of material and designated part numbers identified

Engineering data and technical support provided with help in selecting pipe liner best suited to specific chemicals

Supervision during installation

Undertake turnkey contracts for manufacturing and supplying with installation